Jump to main content
Jump to site search

Issue 14, 2009
Previous Article Next Article

Tunable Liquid Gradient Refractive Index (L-GRIN) lens with two degrees of freedom

Author affiliations

Abstract

We report a tunable optofluidic microlens configuration named the Liquid Gradient Refractive Index (L-GRIN) lens for focusing light within a microfluidic device. The focusing of light was achieved through the gradient refractive index (GRIN) within the liquid medium, rather than via curved refractive lens surfaces. The diffusion of solute (CaCl2) between side-by-side co-injected microfluidic laminar flows was utilized to establish a hyperbolic secant (HS) refractive index profile to focus light. Tailoring the refractive index profile by adjusting the flow conditions enables not only tuning of the focal distance (translation mode), but also shifting of the output light direction (swing mode), a second degree of freedom that to our knowledge has yet to be accomplished for in-plane tunable microlenses. Advantages of the L-GRIN lens also include a low fluid consumption rate, competitive focusing performance, and high compatibility with existing microfluidic devices. This work provides a new strategy for developing integrative tunable microlenses for a variety of lab-on-a-chip applications.

Graphical abstract: Tunable Liquid Gradient Refractive Index (L-GRIN) lens with two degrees of freedom

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Dec 2008, accepted on 25 Mar 2009 and first published on 15 Apr 2009


Article type: Paper
DOI: 10.1039/B822982A
Citation: Lab Chip, 2009,9, 2050-2058
  •   Request permissions

    Tunable Liquid Gradient Refractive Index (L-GRIN) lens with two degrees of freedom

    X. Mao, S. S. Lin, M. I. Lapsley, J. Shi, B. K. Juluri and T. J. Huang, Lab Chip, 2009, 9, 2050
    DOI: 10.1039/B822982A

Search articles by author

Spotlight

Advertisements